write notes on satellites communicate
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Answer:
A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth.
● Defination
Satellite communication is the method of transporting information from one place to another using a communication satellite in orbit around the Earth. Telephone, radio, television, internet, and military applications use satellite communications.
◆ Satellites are specifically made for telecommunication purpose. They are used for mobile applications such as communication to ships, vehicles, planes, hand -held terminals and for TV and radio broadcasting.
A satellite works most efficiently when the transmissions are focused with a desired area. When the area is focused, then the emissions don ‟t go outside that designated area and thus minimizing the interference to the other systems. This leads more efficient spectrum usage.
◆ Satellites communicate by using radio waves to send signals to the antennas on the Earth. The antennas then capture those signals and process the information coming from those signals.
◆ Applications of Satellites:
Weather Forecasting
Radio and TV Broadcast
Military Satellites
Navigation Satellites
Global Telephone
Connecting Remote Area
Global Mobile Communication
◆ There are three types of communication services that satellites provide: telecommunications, broadcasting, and data communications.
◆ Types of Satellites and Applications
Communications Satellite.
Remote Sensing Satellite.
Navigation Satellite.
Geocentric Orbit type staellies - LEO, MEO, HEO.
Global Positioning System (GPS)
Geostationary Satellites (GEOs)
Drone Satellite.
Ground Satellite.